================================================================== BUG: KASAN: slab-use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1619 [inline] BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0xd5f/0xf10 net/bluetooth/l2cap_core.c:7280 Read of size 8 at addr ffff88805a749480 by task kworker/u33:2/5942 CPU: 1 UID: 0 PID: 5942 Comm: kworker/u33:2 Not tainted 6.13.0-rc3-syzkaller-00289-g48f506ad0b68 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: hci3 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 l2cap_conn_ready net/bluetooth/l2cap_core.c:1619 [inline] l2cap_connect_cfm+0xd5f/0xf10 net/bluetooth/l2cap_core.c:7280 hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline] le_conn_complete_evt+0x1623/0x1d10 net/bluetooth/hci_event.c:5763 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7162 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0x666/0x1190 net/bluetooth/hci_event.c:7525 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4035 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5942: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] l2cap_chan_create+0x44/0x920 net/bluetooth/l2cap_core.c:449 l2cap_sock_alloc.constprop.0+0xf5/0x1c0 net/bluetooth/l2cap_sock.c:1888 l2cap_sock_new_connection_cb+0x101/0x240 net/bluetooth/l2cap_sock.c:1470 l2cap_connect_cfm+0x85f/0xf10 net/bluetooth/l2cap_core.c:7263 hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline] le_conn_complete_evt+0x1623/0x1d10 net/bluetooth/hci_event.c:5763 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5789 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7162 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0x666/0x1190 net/bluetooth/hci_event.c:7525 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4035 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 16934: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 l2cap_chan_destroy net/bluetooth/l2cap_core.c:495 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_chan_put+0x216/0x2c0 net/bluetooth/l2cap_core.c:519 l2cap_sock_cleanup_listen+0x4d/0x2a0 net/bluetooth/l2cap_sock.c:1453 l2cap_sock_teardown_cb+0x2bd/0x3c0 net/bluetooth/l2cap_sock.c:1589 l2cap_chan_close+0x1b3/0xa30 net/bluetooth/l2cap_core.c:856 l2cap_sock_shutdown+0x6e5/0x1080 net/bluetooth/l2cap_sock.c:1372 l2cap_sock_release+0x78/0x210 net/bluetooth/l2cap_sock.c:1416 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88805a749000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1152 bytes inside of freed 2048-byte region [ffff88805a749000, ffff88805a749800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a748 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801ac42f00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 04fff00000000040 ffff88801ac42f00 dead000000000100 dead000000000122 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 04fff00000000003 ffffea000169d201 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 15738, tgid 15738 (kworker/u32:17), ts 499209030767, free_ts 499208143814 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xce2/0x1650 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_track_caller_noprof+0x2ee/0x520 mm/slub.c:4317 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 pskb_expand_head+0x236/0x1170 net/core/skbuff.c:2275 netlink_trim+0x1ef/0x250 net/netlink/af_netlink.c:1303 netlink_broadcast_filtered+0xc7/0xef0 net/netlink/af_netlink.c:1509 nlmsg_multicast_filtered include/net/netlink.h:1128 [inline] nlmsg_multicast include/net/netlink.h:1147 [inline] nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2585 rtnl_notify net/core/rtnetlink.c:943 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4376 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4392 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4379 [inline] rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4398 dev_close_many+0x318/0x6a0 net/core/dev.c:1588 unregister_netdevice_many_notify+0x489/0x1e60 net/core/dev.c:11500 page last free pid 16579 tgid 16579 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2659 __put_partials+0x14c/0x170 mm/slub.c:3157 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_noprof+0x1d1/0x4f0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] inotify_handle_inode_event+0x1c7/0x600 fs/notify/inotify/inotify_fsnotify.c:96 fsnotify_handle_inode_event.isra.0+0x1d0/0x360 fs/notify/fsnotify.c:298 fsnotify_handle_event fs/notify/fsnotify.c:353 [inline] send_to_group fs/notify/fsnotify.c:401 [inline] fsnotify+0x1140/0x1b60 fs/notify/fsnotify.c:610 __fsnotify_parent+0x7ad/0xac0 fs/notify/fsnotify.c:264 fsnotify_parent include/linux/fsnotify.h:96 [inline] fsnotify_file include/linux/fsnotify.h:131 [inline] fsnotify_close include/linux/fsnotify.h:412 [inline] __fput+0x306/0xb60 fs/file_table.c:436 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Memory state around the buggy address: ffff88805a749380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a749400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805a749480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805a749500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a749580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================